Lawn-mower sharpener.



A. E. JERNANDER.

LAWN MOWER SHARPENERr APPLICATION FILED JULY 27, 1911,

1,03 1,006. Patented July 2, 1912.

ITNESSES: 1.7V VIEW TOR.

4 k 9 5 mh u 524 i Anon/m (UN TED STATES. PATENT OFFICE.

ALFRED E. JERNANDER, OF FARIBA ULT, MINNESOT -1 LAWN-MOWER SHARPENER.

To all whom it may concern:

Be it known that I, ALFRED E. JERNAN- min, a citizen of the United States, residing at Faribault, in the county of Rice and State of "Minnesota, have invented a new and usefull Lawn-Mower Sharpener, of whichthe following is a specification.

My invention relates to devices for sharpening lawn-mowers; and the main object is to provide a durable and efficient sharpening device which may be attached to a lawn-mower in such position relative to the cutters that the latterm'ay be sharpened by the ordinary operation of the lawn-mower. This and other objects I attain by the novel construction and combination of parts illustrated in the accompanying drawing, in

which I p v Figure l is atop or plan View of a lawnmower equipped with my sharpening device. Fig. 2 is a section on the. line.a-a Fig. 1 with the handle of themower omitted. Fig. 3 is a portion of the upper left hand corner of F1g.'2 modified; Fig. 4 is a detail bottom view of the clamping plate 11 in the other views.

Referring to the drawing by reference numerals, -1 designates the handle, 2 the cheek plates and 3 the front bar which secures said plates together and with the fixed cutter bar 4 form the frame of the machine.

Said frame is supported -.by-the usual rear roller 5 and two ground wheels 6; the latter serving also as drivingwheels to rotate the winged cutter shaft 7, on which spirally curved cutters .8 are secured and adapted to eo-act with the fixed cutter 4, all of which, together with the ratchet mechanism (not shown) connecting the ground wheels with the cutter, may be of any of the well known forms and thus need not here be further described.

On the front frame bar 3 I clamp by clips 9 and nuts 10 thereon two bracket plates 11, each of which has a bracket portion 12, in

' which is secured by a set-screw 13 the upper end of an angularly bent spring 14, which may be plain as in Fig. 3 or may have a coil 15 as shown in Figs. 1 and 2, to increase the tlexibilitysof the spring.

The downward arm of each spring is formed with a horizontal end portion 16, on which is adjustably secured by a set-screw 17 a casting 18. Said casting is formed with a plate 19, whiclr by wood-screws 20, or other means, is secured to the front side Specification of Letters Patent.

.wid-med or closed accordinglasf th ban Patented July 2, 1912.

Application raea an 21, 151i. Serial No. 640,814. 7

of a channel-shaped wooden bar 21, in the channel or groove of which is placed a metallic strip '22 (see Fig. 2) on which act the ends of adjustment screws 23 to take up 60 the wear of a stone 24, which is held in the groove of bar .21 by frictionalgicontact'with the sides of the groove, the sides jb'cing sprung toward the stone by clainps 25 iwhicli are preferably made integral fii th=the.cast mgs 18-19, and are each provided with a screw-.26 by which to press upon-the idjtlcent side of the channelbanQlnFig..2,the head of the feed screwl23 is lbr okniawa to expose the arm l6,o f the spring, b i 1 76 23 in Figs. 1 and 2,will make.thatip f" the structure plain; f 55f;-

In Fig. 4 it is best shownfthat the plate j 11 is preferably 'providedtwith ch 27 Y for the. clips 9, sothatgthdclip y be f may be extra large or small indiani'eter. In; J all cases where thebar 3 is-rou'njdthe.

of the groove 28 of the plate wintake" smaller radius than any of the bars. In Fig. 3 is shown that when the bar 3" is ectangular in cross section its upper side \Vlll fit the underside of the plate 11 without entering into the groove 28 of same. The stone slab or strip 24 -m ay=beo'f any suitable kind of stone, but I prefer stones made of emery, corundum and carborundum, especially the latter, as the same may be used dry at high speed without taking the temper out of the cutters.

In the operation the device is secured on the machine as shown and adjusted with the straight rear edge of the stone in contact with the edges ofthc cutters 8, and the machine is pushed along on the floor or on-the ground so that the cutter shaft 7' rotates,

the cutters will then in passing the stone become sharpened; the spring 14 holding the stone in suitable contact wlth the passing cutters. By means of the screws 17 the stone may be regulated up or down according to the size of the lawn-mower and by the screws 13 the sharpening attachments may be adjusted backward and forward in the gnachirflk etc-1 cording to the size, and arrangeiiiei'its of the parts of themower. The device may be used with or without water or moisture on the stone. If the lawn-mower is much in use, especially on ground where-it is exposed a-firm i hold of the bar, the groove being made bn a 80 n :ntly on it, otherwise it may be removed until such times as it will occasionally be needed.

What I claim is 1. In a lawn mower sharpener, a pair of brackets securable upon a bar of the mower frame, a spring arm extending horizontally and then downwardly from each bracket, a secondary bracket secured on the downward portion of each spring arm and formed with a U-shaped clamp or fork, an integral wooden bar held near its ends in said forks and having in one side an angular groove, an abrading member inserted in said groove, ar a set-screw through one tine of each .ik, to press with its end upon the side of the grooved bar, so as to spring the same into squeezing engagement with the abrading member and thereby hold the latter firmly in the groove.

2. In a lawn mower sharpener, a pair of brackets securable upon a bar of the mower frame, a spring arm extending horizontally and then downwardly from each bracket, a secondary bracket secured on the downward portion of each spring arm and formed with a fork,,an integral woodenbar held near its ends in said forks and havinginbneside an angular longitudinal groove,'an abrading member inserted in said groove, and a set screw through oneiine of each fork, for closing .the 'wooden ba'r aga ,the; member,-toi h old the'latter inst the sides of;-

firmly in the groove; a metal strip extending along the bottom of the groove so as to support the abradmg member, and feed screws v arranged to press said strip against the abradmg member and thereby easily adjust the latter to' 'the best working position.

-3.- In a lawn mower sharpener, a pair ofbrackets having clamping means for securing' same on a-bar of the mower frame'and provided with a hole in each bracket, a

spring arm having a substantially hbrizontal and: also a vertical portion, a forked bracket having a holereceiving'each of the vertical portions, set-screws holding .the spring arms adjustably in the forked brac'kets and in the holes of the first-mentioned brackets, a longitudinally grooved wooden bar secured in the ets, feed screws through thei'bottom of the groove in the wooden bar, a metal strip in the groove, and an abrading element at the outer side of said strip in the groove,-and

set-screws in onetime of each fork arranged to press on he wooden barand close it tightly Jagainstfthe, -.sides of the abrading element. J T

In testimony whereof I-aflix my signature, in presence of two" witnesses.

. ALFREDiE fJ'ERNAN DER.

forks of the forked brack- 

